<!DOCTYPE html>
<html>
<head>
    <style type="text/css">
        body {
            margin: 0;
            padding: 0;
            background-color: #FAFAFA;
            font: 12pt "Tahoma";
        }

        * {
            box-sizing: border-box;
            -moz-box-sizing: border-box;
        }

        .page {
            width: 21cm;
            min-height: 29.7cm;
            padding: 0.5cm;
            margin: 1cm auto;
            border: 1px #D3D3D3 solid;
            border-radius: 5px;
            background: white;
            box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
        }

        @page {
            size: A4;
            margin: 0;
        }

        @media print {
            .page {
                margin: 0;
                border: initial;
                border-radius: initial;
                width: initial;
                min-height: initial;
                box-shadow: initial;
                background: initial;
                page-break-after: always;
            }
        }
    </style>
</head>
<body>
    <div class="page">
        <h1 style="text-align:center">这是一张A4纸在网页上的体现</h1>
        </br>
        内容放这里就好!!!【Ctrl+p】打印
    </div>
</body>
</html>